The public address announcer shouted that warning to a packed Action Sports Arena inside the Orange County Fair, where county police officers and firefighters were about to smash each other in the Motorhome Madness Demolition Derby on Friday night.

Police and fire chiefs from various Orange County organizations, including winner Chief Stu Greenberg of the Tustin Police Department, compete in the Motorhome Madness Demolition Derby at the Orange County Fair on Friday, August 9, 2019. (Photo By Jeff Antenore, Contributing Photographer)

After 30 minutes of bashing and crashing, the RV commandeered by Tustin Police Chief Stu Greenberg was the only one of the RVs in the derby still able to move, albeit barely.

And as any fan of demolition derbies knows, the last man standing is the winner.

Stu Greenberg, left, the Chief of Police for the City of Tustin, tries to protect his motorhome while also trying to inflict damage against other motorhomes, driven by local police and fire chiefs, while competing in the Motorhome Madness Demolition Derby, which he won, at the Orange County Fair on Friday, August 9, 2019. (Photo By Jeff Antenore, Contributing Photographer)

“I expected to be out first,” Greenberg said. “I thought these guys were going to kill me.”

Greenberg, who was competing in his first ever demolition derby, studied film of demolition derbies from previous years, gleaning any sort of edge he could find.

“I was trying to bait them into me, fishtail it and then back into them,” Greenberg said.

Police and fire chiefs from various Orange County organizations, including winner Chief Stu Greenberg of the Tustin Police Department, compete in the Motorhome Madness Demolition Derby at the Orange County Fair on Friday, August 9, 2019. (Photo By Jeff Antenore, Contributing Photographer)

The chief did most of his damage to opponents by rolling in reverse and plowing into their RVs with the back end of his vehicle, thereby keeping his engine and radiator on the front end intact.

“Of course he won,” said the Chief’s son, Steve Greenberg, who is an Orange County Sheriff’s deputy. “He’s good at everything he does.”

Stu Greenberg, the Chief of Police for the City of Tustin, tries to protect his motorhome while also trying to inflict damage against other motorhomes, driven by local police and fire chiefs, while competing in the Motorhome Madness Demolition Derby, which he won, at the Orange County Fair on Friday, August 9, 2019. (Photo By Jeff Antenore, Contributing Photographer)

Greenberg spent more than 30 years with the Orange County Sheriff’s Department before taking over as Chief of Tustin P.D. in January.

Plenty of supporters from both agencies were on hand cheering the chief on, including Tustin P.D. top brass.

Tustin Police Chief Stu Greenberg gets into the motorhome he drove in Friday’s Demolition Derby against other local police and fire chiefs at the Orange County Fair on August 9, 2019. (Photo By Jeff Antenore, Contributing Photographer)

“I love those people … all 4,000 of them,” Greenberg said of his former OCSD colleagues. “I never thought I’d find it again, but I found it in Tustin. I got lucky twice.”

Orange Police Chief Tom Kisela also rooted for Greenberg in the arena.

Stu Greenberg, the Chief of Police for the City of Tustin, triumphantly emerges from the wreckage of his motorhome as the winner of the Motorhome Madness Demolition Derby at the Orange County Fair on Friday, August 9, 2019. (Photo By Jeff Antenore, Contributing Photographer)

Greenberg said the demolition derby elevates the friendly rivalry between police officers and firefighters to a new level.

“The big thing is, besides all the fun and everything else, it’s for a good cause,” said Greenberg, who raised money for the Tustin Police Foundation.

Tustin Police Chief Stu Greenberg sits in the driver’s seat of the motorhome he drove in the Demolition Derby against other local police and fire chiefs at the Orange County Fair on August 9, 2019. (Photo By Jeff Antenore, Contributing Photographer)

Having 30-plus years on the job, Greenberg said there weren’t relatable driving stories to the demolition derby experience.

“In a police car, we’ve got to be safe,” Greenberg said. “We’ve got to take care of our partners. We’ve got to take care of the public and even somebody we’re chasing. We’ve got to make them safe too, as best we can. Here, we just let it all hang loose.”

Orange County Police and Fire Chiefs stand together with a giant check commemorating the $40,361 that was raised for various charities at the Motorhome Madness Demolition Derby at the Orange County Fair on August 9, 2019. (Photo By Jeff Antenore, Contributing Photographer)